John edward evard



(No Model.) J.E.EVARD.

MACHINE FOR SETTING PRECIOUS STONES IN DOPS FOR POLISHING AND GRINDING.

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m @E, 9 WM 7, U 5 W, 5 a N NITED TTATES PATENT OFFICE JOHN EDWARD EVARD,OF INDIANAPOLIS, INDIANA.

MACHINE FOR SETTING PRECIOUS STONES IN DOPS FOR POLISHING AND GRINDING.

SPECIFICATION forming part of Letters Patent No. 557,981, dated April 7,1896.

Original application filedApi-il 23,1895, Serial No. 546,877.

Divided and this application filed June 16, 1895. Serial No.

552,955. (No model.)

To aZZ whom it may concern:

Be it known that I, JOHN EDWARD EVARD, a citizen of the United States,residing at Indianapolis, in the, county of Marion and State of Indiana,have invented certain new and useful Improvements in Machines forSetting Precious Stones in Dops for Polishing or Grinding; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My said invention consists in an improved construction and arrangementof stand embodying a clamping device and mold for use in setting andsecuring diamonds. upon a dop preparatory to being placed in a dopholder or frame to be polished, by the use of which 1 the fusiblemetalwhich is used to secure said stone may be easily and quicklychanged around it to expose different portions of its surface, asdesired.

This application is a division of my application, Serial No. 546,877,filed April 23,1895, and its subject-matter is therein shown and brieflydescribed, but not claimed,it being especially designed for use inconnection with the dop-holding frame forming the subjectmatter of saidapplication, but may be used with other polishing mechanism, as will bereadily understood.

Referring to the accompanying drawings, which are made a part hereof,and on which similar letters of reference indicate similar parts, Figure1 is a perspective view of said stand embodying the clamping device andmold; Fig. 2, a detail side elevation of a portion of said stand; Fig.3, a detailvertical section through a portion thereof, and Fig. 4 adetail view showing a diamond in its seat on the dop.

In said drawings the portions marked A represent the main portion of theframe or stand; B, the clamping-rod or jaw; C, the dop, and D the mold.Said stand A consists of a suitable basehaving hinged to it, by means ofa pivot a, a horizontal plate A, which carries upon one end a curvedupright Aiwhich terminates at its top in a sleeve a having a centralperforation in which is mounted the gclamping-rod B,which may be securedin any position therein by means of a thumb-screw 00?, mounted in ascrew-threaded perforation in the side of said sleeve and adapted toimpinge at its inner end upon the side of said rod. The central portionof the plate A is cut away and a bar A carrying a sleeve a is pivoted atone end to the under side of said plate A and is secured in the positionshown in Fig. 1 by a button a mounted upon the outer end of said plate Aand adapted to engage with the edge of said plate A and when turned halfround securely lock the two plates together. When in such position, theperforations in the sleeve a and sleeve c are exactly in line. 7

The clamping rod or jaw B is any suitable be held therein in any desiredadjustment by the set-screw 0, as before described. Its

lower end orpoint is preferably formed small,

but square, so that it will rest firmly upon the table or cullet of thediamond and bear directly upon its center, or in line with its verticalaxis, and its upper end extends above the sleeve to form a suitablehandle for manipulation and to which force may be applied in use.

The dop O is in main of an ordinary construction, consisting of asuitable stem having a cup on its end of sufficient size and shape toproperly support the metal molded around the stone, and a central stud0, extending out from the center of said cup slightly beyond its edge,with a suitablyformed seat or rest 0 for the diamond on its end. Saidstud c is directly in line with and practically an extension of saidstem. The rest or seat 0 I prefer to form in a separate piece and ofcopper or other metal of like nature, which is soft and permits theedges of the stone to be forced into it slightly, which adds greatly tothe security of the position of the stone. It is formed with a shankwhich sets into a perforation in said stud c, and with a cup-shaped faceof that shape and size and with its walls of that angle which will bestconform to the size and shape of the stone to rod adapted to fit closelyin the sleeve a and be set therein. Each seat is preferably formed withits sides or walls of that angle which will give the stone a rest on itscorners near its edge, (indicated in Fig. 4,) thus affording a wide baseor seat for its under side, which, with the narrow point or end of theclamping-bar bearing upon its top exactly in the center of the stone andits seat, secures it beyond the possibility of movement. Thesecup-shaped tips'may in practice be supplied in quantities with seats ofdifferent sizes and shapes, the shank of all being of standard size, sothat a seat for any-sized stone may be readily provided on any dop.

The mold D is of an ordinary construction, adapted to closely embracethe sides of the cup of the dop when closed thereon, with its sidesprojecting up above said cup and closing the same, except on one side,as shown. It is pivotally supported on an arm D, which in turn is hingedto a stud D on the side of the curved upright A said arm being of justthe length required to bring the two parts of the mold into position toembrace the cup when desired. This arrangement secures said mold whereit is always in position to be used conveniently and quickly, and yetpermits it to be swung around entirely out of the way when not in. use.

It will be understood, of course, that while the construction describedis that whichv has been found desirable, yet I do not limit myself toall its details, which may obviously be i changed or varied in form andarrangement without departing from my invention, as hereinafter claimed.

In operation one of the dops to which it is desired to secure thediamond is placed with its shank in the sleeve 0. in the plate A whichplate is then swung to and locked in the posit-ion shown in Fig. 1. Oneof the softmetal tips 0 is then put in place. The stone to be polishedis then placed in the cupshaped face of the tip, with its table andcullet in exact line with the center of the spindle of the dop and theclamping bar or rod B. Said rod is then pressed down upon the uppersurface of the stone with force sufficient to press its edges into thesoft-metal seat slightly and securely clamp said stone in this position.

The set-screw C03 is then turned tightly against saidrod to prevent itfrom moving. The plate A is then tilted on the stand so that thatportion of the stone which it is desired to expose for polishing shallbe brought uppermost, the dop having previously been inserted with theside of the stone in that position which renders thispossible. The inold isthen brought around the top of said dop closely and the metalturned in and allowed to cool, which secures the stone as desired bythis old and well-known means. The stone having been thus secured to thedop, the dop is removed andis ready to be placedin a holder or frame forpolishing the stone. As each facet is polished, the dops holding them.are

placed in said stand and the stone securely clamped by the clamping-rod,as before described, which holds the stone firmly in its originalposition and renders it possible to melt the fusible metal, tilt theplate, so as to expose the neXt facet to be polished, and permit saidmetal to run down into the mold around the remaining portions of thestone and again thus secure it for the polishing apparatus without anydanger of its position in its seat having changed and the polishingscheme thereby disturbed. By this means the entire stone,lexcept thesmall portion of the surface being polished, is embedded in the metaland thus securely held to the dop, v(as has been found to be the onlypractical way in which a diamond can be held while fbeing polished)while the position of said istone on the dop is not changed during the.polishing of eachside thereof.

Having thus fully described my said invention, what I claim as new, anddesire to se- Ecure by Letters Patent, is-

1. In a diamond-polishing apparatus, a ;frame for holding the dop whilethe stone is being secured thereto, which consists of a iseat in whichsaid dop may be mounted, a clamping-jaw directly in line with said dopiwhen in position, and a mold adapted" to be ,brought around said dop,said several parts ibeing mounted on a tilting frame, substanitially asset forth. 2. In an apparatus for securing diamonds for polishing, thecombination of'the dop provided with a cup-shaped seat for the stone,the walls of: which are of an angle to afford ,said stone a rest nearits girdle, a stand or frame in which said dop is mounted, and a@clamping jaw or bar arranged directly in line }with the center of saidseat with its point to ibear upon the center of the side of the diajmondopposite that resting in said seat, substantially as set forth.

3. In an apparatus for securing diamonds ifor polishing, the combinationof a suitable {frame, and a base carrying a seat for the dop iand aclamping-jaw in line therewith, mountjed to be tilted thereon,substantially as set ;forth.

4'. In a diamond-polishing apparatus, the ,combination of the stand, A,the plate, A, @hinged thereto, the plate, A hinged to said plate, A,provided with a sleeve, a the dop "mounted in said sleeve, the standard,A mounted on one end of said plate, A, carry- ;ing a sleeve, (6 ,1116clamping-bar, 13, mounted ,in said sleeve, and the mold, D, allsubstantially as set forth.

5. I11 a diamond-polishing apparatus, the combination of the stand,.thetilting frame .mounted thereon carrying a'seat for the diaimond, and aclampingjaw for holding it therein, anda mold hinged to a portion oftially as set forth.

6. A device for holding diamonds while be- In testimony whereof I affixmy signature ing secured to a dop, to be polished, consistin presence oftwo witnesses. ing of a frame having a seat or rest for the dop, and aclamping-jaw arranged in line JOHN EDWARD EVARD' 5 therewith and adaptedto bear upon the side \Vitnesses:

of the stone opposite that which rests in said WILLIAM W. HEROD,

(10p, substantially as 'set forth. CARL F. WALK.

